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501 5.1.7 invalid address exchange server


How to fix email error ‘501 5.1.7 invalid address’ in Exchange servers

How to fix email error ‘501 5.1.7 invalid address’ in Exchange servers

A commonly noted error in Microsoft Exchange 2007 server is when the emails from certain 3rd party applications or scripts fail to deliver.

The mails get rejected, giving this error message in the logs:

SMTP MAIL command failed Error (501) 5.1.7 Invalid address

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